2 * Helper routines to scan the device tree for PCI devices and busses
4 * Migrated out of PowerPC architecture pci_64.c file by Grant Likely
5 * <grant.likely@secretlab.ca> so that these routines are available for
8 * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
9 * Rework, based on alpha PCI code.
10 * Copyright (c) 2009 Secret Lab Technologies Ltd.
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * version 2 as published by the Free Software Foundation.
17 #include <linux/pci.h>
18 #include <asm/pci-bridge.h>
22 * get_int_prop - Decode a u32 from a device tree property
24 static u32
get_int_prop(struct device_node
*np
, const char *name
, u32 def
)
29 prop
= of_get_property(np
, name
, &len
);
36 * pci_parse_of_flags - Parse the flags cell of a device tree PCI address
37 * @addr0: value of 1st cell of a device tree PCI address.
38 * @bridge: Set this flag if the address is from a bridge 'ranges' property
40 unsigned int pci_parse_of_flags(u32 addr0
, int bridge
)
42 unsigned int flags
= 0;
44 if (addr0
& 0x02000000) {
45 flags
= IORESOURCE_MEM
| PCI_BASE_ADDRESS_SPACE_MEMORY
;
46 flags
|= (addr0
>> 22) & PCI_BASE_ADDRESS_MEM_TYPE_64
;
47 flags
|= (addr0
>> 28) & PCI_BASE_ADDRESS_MEM_TYPE_1M
;
48 if (addr0
& 0x40000000)
49 flags
|= IORESOURCE_PREFETCH
50 | PCI_BASE_ADDRESS_MEM_PREFETCH
;
51 /* Note: We don't know whether the ROM has been left enabled
52 * by the firmware or not. We mark it as disabled (ie, we do
53 * not set the IORESOURCE_ROM_ENABLE flag) for now rather than
54 * do a config space read, it will be force-enabled if needed
56 if (!bridge
&& (addr0
& 0xff) == 0x30)
57 flags
|= IORESOURCE_READONLY
;
58 } else if (addr0
& 0x01000000)
59 flags
= IORESOURCE_IO
| PCI_BASE_ADDRESS_SPACE_IO
;
61 flags
|= IORESOURCE_SIZEALIGN
;
66 * of_pci_parse_addrs - Parse PCI addresses assigned in the device tree node
67 * @node: device tree node for the PCI device
68 * @dev: pci_dev structure for the device
70 * This function parses the 'assigned-addresses' property of a PCI devices'
71 * device tree node and writes them into the associated pci_dev structure.
73 static void of_pci_parse_addrs(struct device_node
*node
, struct pci_dev
*dev
)
82 addrs
= of_get_property(node
, "assigned-addresses", &proplen
);
85 pr_debug(" parse addresses (%d bytes) @ %p\n", proplen
, addrs
);
86 for (; proplen
>= 20; proplen
-= 20, addrs
+= 5) {
87 flags
= pci_parse_of_flags(addrs
[0], 0);
90 base
= of_read_number(&addrs
[1], 2);
91 size
= of_read_number(&addrs
[3], 2);
95 pr_debug(" base: %llx, size: %llx, i: %x\n",
96 (unsigned long long)base
,
97 (unsigned long long)size
, i
);
99 if (PCI_BASE_ADDRESS_0
<= i
&& i
<= PCI_BASE_ADDRESS_5
) {
100 res
= &dev
->resource
[(i
- PCI_BASE_ADDRESS_0
) >> 2];
101 } else if (i
== dev
->rom_base_reg
) {
102 res
= &dev
->resource
[PCI_ROM_RESOURCE
];
103 flags
|= IORESOURCE_READONLY
| IORESOURCE_CACHEABLE
;
105 printk(KERN_ERR
"PCI: bad cfg reg num 0x%x\n", i
);
109 res
->end
= base
+ size
- 1;
111 res
->name
= pci_name(dev
);
116 * of_create_pci_dev - Given a device tree node on a pci bus, create a pci_dev
117 * @node: device tree node pointer
118 * @bus: bus the device is sitting on
119 * @devfn: PCI function number, extracted from device tree by caller.
121 struct pci_dev
*of_create_pci_dev(struct device_node
*node
,
122 struct pci_bus
*bus
, int devfn
)
127 dev
= alloc_pci_dev();
130 type
= of_get_property(node
, "device_type", NULL
);
134 pr_debug(" create device, devfn: %x, type: %s\n", devfn
, type
);
138 dev
->dev
.parent
= bus
->bridge
;
139 dev
->dev
.bus
= &pci_bus_type
;
141 dev
->multifunction
= 0; /* maybe a lie? */
143 dev
->vendor
= get_int_prop(node
, "vendor-id", 0xffff);
144 dev
->device
= get_int_prop(node
, "device-id", 0xffff);
145 dev
->subsystem_vendor
= get_int_prop(node
, "subsystem-vendor-id", 0);
146 dev
->subsystem_device
= get_int_prop(node
, "subsystem-id", 0);
148 dev
->cfg_size
= pci_cfg_space_size(dev
);
150 dev_set_name(&dev
->dev
, "%04x:%02x:%02x.%d", pci_domain_nr(bus
),
151 dev
->bus
->number
, PCI_SLOT(devfn
), PCI_FUNC(devfn
));
152 dev
->class = get_int_prop(node
, "class-code", 0);
153 dev
->revision
= get_int_prop(node
, "revision-id", 0);
155 pr_debug(" class: 0x%x\n", dev
->class);
156 pr_debug(" revision: 0x%x\n", dev
->revision
);
158 dev
->current_state
= 4; /* unknown power state */
159 dev
->error_state
= pci_channel_io_normal
;
160 dev
->dma_mask
= 0xffffffff;
162 if (!strcmp(type
, "pci") || !strcmp(type
, "pciex")) {
163 /* a PCI-PCI bridge */
164 dev
->hdr_type
= PCI_HEADER_TYPE_BRIDGE
;
165 dev
->rom_base_reg
= PCI_ROM_ADDRESS1
;
166 } else if (!strcmp(type
, "cardbus")) {
167 dev
->hdr_type
= PCI_HEADER_TYPE_CARDBUS
;
169 dev
->hdr_type
= PCI_HEADER_TYPE_NORMAL
;
170 dev
->rom_base_reg
= PCI_ROM_ADDRESS
;
171 /* Maybe do a default OF mapping here */
175 of_pci_parse_addrs(node
, dev
);
177 pr_debug(" adding to system ...\n");
179 pci_device_add(dev
, bus
);
183 EXPORT_SYMBOL(of_create_pci_dev
);
186 * of_scan_pci_bridge - Set up a PCI bridge and scan for child nodes
187 * @node: device tree node of bridge
188 * @dev: pci_dev structure for the bridge
190 * of_scan_bus() calls this routine for each PCI bridge that it finds, and
191 * this routine in turn call of_scan_bus() recusively to scan for more child
194 void __devinit
of_scan_pci_bridge(struct device_node
*node
,
198 const u32
*busrange
, *ranges
;
200 struct resource
*res
;
204 pr_debug("of_scan_pci_bridge(%s)\n", node
->full_name
);
206 /* parse bus-range property */
207 busrange
= of_get_property(node
, "bus-range", &len
);
208 if (busrange
== NULL
|| len
!= 8) {
209 printk(KERN_DEBUG
"Can't get bus-range for PCI-PCI bridge %s\n",
213 ranges
= of_get_property(node
, "ranges", &len
);
214 if (ranges
== NULL
) {
215 printk(KERN_DEBUG
"Can't get ranges for PCI-PCI bridge %s\n",
220 bus
= pci_add_new_bus(dev
->bus
, dev
, busrange
[0]);
222 printk(KERN_ERR
"Failed to create pci bus for %s\n",
227 bus
->primary
= dev
->bus
->number
;
228 bus
->subordinate
= busrange
[1];
232 /* parse ranges property */
233 /* PCI #address-cells == 3 and #size-cells == 2 always */
234 res
= &dev
->resource
[PCI_BRIDGE_RESOURCES
];
235 for (i
= 0; i
< PCI_NUM_RESOURCES
- PCI_BRIDGE_RESOURCES
; ++i
) {
237 bus
->resource
[i
] = res
;
241 for (; len
>= 32; len
-= 32, ranges
+= 8) {
242 flags
= pci_parse_of_flags(ranges
[0], 1);
243 size
= of_read_number(&ranges
[6], 2);
244 if (flags
== 0 || size
== 0)
246 if (flags
& IORESOURCE_IO
) {
247 res
= bus
->resource
[0];
249 printk(KERN_ERR
"PCI: ignoring extra I/O range"
250 " for bridge %s\n", node
->full_name
);
254 if (i
>= PCI_NUM_RESOURCES
- PCI_BRIDGE_RESOURCES
) {
255 printk(KERN_ERR
"PCI: too many memory ranges"
256 " for bridge %s\n", node
->full_name
);
259 res
= bus
->resource
[i
];
262 res
->start
= of_read_number(&ranges
[1], 2);
263 res
->end
= res
->start
+ size
- 1;
266 sprintf(bus
->name
, "PCI Bus %04x:%02x", pci_domain_nr(bus
),
268 pr_debug(" bus name: %s\n", bus
->name
);
270 mode
= PCI_PROBE_NORMAL
;
271 if (ppc_md
.pci_probe_mode
)
272 mode
= ppc_md
.pci_probe_mode(bus
);
273 pr_debug(" probe mode: %d\n", mode
);
275 if (mode
== PCI_PROBE_DEVTREE
)
276 of_scan_bus(node
, bus
);
277 else if (mode
== PCI_PROBE_NORMAL
)
278 pci_scan_child_bus(bus
);
280 EXPORT_SYMBOL(of_scan_pci_bridge
);
283 * __of_scan_bus - given a PCI bus node, setup bus and scan for child devices
284 * @node: device tree node for the PCI bus
285 * @bus: pci_bus structure for the PCI bus
286 * @rescan_existing: Flag indicating bus has already been set up
288 static void __devinit
__of_scan_bus(struct device_node
*node
,
289 struct pci_bus
*bus
, int rescan_existing
)
291 struct device_node
*child
;
296 pr_debug("of_scan_bus(%s) bus no %d... \n",
297 node
->full_name
, bus
->number
);
299 /* Scan direct children */
300 for_each_child_of_node(node
, child
) {
301 pr_debug(" * %s\n", child
->full_name
);
302 reg
= of_get_property(child
, "reg", ®len
);
303 if (reg
== NULL
|| reglen
< 20)
305 devfn
= (reg
[0] >> 8) & 0xff;
307 /* create a new pci_dev for this device */
308 dev
= of_create_pci_dev(child
, bus
, devfn
);
311 pr_debug(" dev header type: %x\n", dev
->hdr_type
);
314 /* Apply all fixups necessary. We don't fixup the bus "self"
315 * for an existing bridge that is being rescanned
317 if (!rescan_existing
)
318 pcibios_setup_bus_self(bus
);
319 pcibios_setup_bus_devices(bus
);
321 /* Now scan child busses */
322 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
323 if (dev
->hdr_type
== PCI_HEADER_TYPE_BRIDGE
||
324 dev
->hdr_type
== PCI_HEADER_TYPE_CARDBUS
) {
325 struct device_node
*child
= pci_device_to_OF_node(dev
);
327 of_scan_pci_bridge(child
, dev
);
333 * of_scan_bus - given a PCI bus node, setup bus and scan for child devices
334 * @node: device tree node for the PCI bus
335 * @bus: pci_bus structure for the PCI bus
337 void __devinit
of_scan_bus(struct device_node
*node
,
340 __of_scan_bus(node
, bus
, 0);
342 EXPORT_SYMBOL_GPL(of_scan_bus
);
345 * of_rescan_bus - given a PCI bus node, scan for child devices
346 * @node: device tree node for the PCI bus
347 * @bus: pci_bus structure for the PCI bus
349 * Same as of_scan_bus, but for a pci_bus structure that has already been
352 void __devinit
of_rescan_bus(struct device_node
*node
,
355 __of_scan_bus(node
, bus
, 1);
357 EXPORT_SYMBOL_GPL(of_rescan_bus
);